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Photocatalyst antiviral coatings - Covid 19

光触媒抗病毒涂料 - Covid 19

基本信息

批准号：
555232-2020
负责人：
Jodoin, Bertrand
金额：
$ 3.64万
依托单位：
University of Ottawa
依托单位国家：
加拿大
项目类别：
Alliance Grants
财政年份：
2020
资助国家：
加拿大
起止时间：
2020-01-01 至 2021-12-31
项目状态：
已结题

来源：
https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=705640
关键词：
Photocatalyst antiviral coatings Covid 19

项目摘要

Titanium dioxide (TiO2), either in the anatase or rutile crystalline form, is a well-known photocatalyst. Upon exposure to ultraviolet light, free radicals are generated at the surface-atmosphere interface. These are highly efficient oxidizers of organic matter and can be used in sterilization, sanitation, and remediation applications. Rutile and anatase have different damage effects and contact-killing abilities. These differences become an advantage, and the creation of rutile and anatase mixtures (heterojunctions) have demonstrated higher reactivity than either single-phase material. Many manufacturing processes can produce anatase/rutile coatings, starting from powders or from gaseous precursors. However, their ability to do in-situ processing-repair-coating and scaling-up is far from demonstrated. While such processes produce thick TiO2 layers, it is known that only a thin layer (hundreds of nanometers) is required as this layer is not consumed during the free-radical generation. We propose to produce anatase/rutile nanolayers around titanium powder particles and consolidate these powders into thin coatings. These coatings would provide heterojunctions and be visible-light sensitized, thus not requiring ultraviolet light to operate, ultimately creating a surface capable of killing viruses upon contact.

二氧化钛 (TiO2)，无论是锐钛矿还是金红石晶体形式，都是一种众所周知的光催化剂。暴露于紫外线后，表面-大气界面处会产生自由基。这些是有机物的高效氧化剂，可用于灭菌、卫生和修复应用。金红石和锐钛矿具有不同的伤害效果和接触杀伤能力。这些差异成为一种优势，金红石和锐钛矿混合物（异质结）的产生已证明比任何一种单相材料都具有更高的反应性。许多制造工艺可以从粉末或气态前体开始生产锐钛矿/金红石涂层。然而，它们进行原位加工-修复-涂层和放大的能力还远未得到证实。虽然此类过程产生厚的 TiO2 层，但众所周知，只需要薄层（数百纳米），因为该层在自由基生成过程中不会被消耗。我们建议在钛粉末颗粒周围生产锐钛矿/金红石纳米层，并将这些粉末固结成薄涂层。这些涂层将提供异质结并且对可见光敏感，因此不需要紫外线来操作，最终形成能够在接触时杀死病毒的表面。